https://sourceware.org/bugzilla/show_bug.cgi?id=25767
Bug ID: 25767
Summary: Zero-sized relocation section causes linker assert
Product: binutils
Version: 2.35 (HEAD)
Status: NEW
Severity: normal
Priority: P2
Component: ld
Assignee: unassigned at sourceware dot org
Reporter: hjl.tools at gmail dot com
Target Milestone: ---
./ld -r -o y.o binary_confusion_matrix_fpt_dbl.o
./ld: BFD (GNU Binutils) 2.34.50.20200402 assertion fail
/export/gnu/import/git/gitlab/x86-binutils/bfd/elf.c:3652
./ld: BFD (GNU Binutils) 2.34.50.20200402 assertion fail
/export/gnu/import/git/gitlab/x86-binutils/bfd/elf.c:3652
./ld: BFD (GNU Binutils) 2.34.50.20200402 assertion fail
/export/gnu/import/git/gitlab/x86-binutils/bfd/elf.c:3652
./ld: BFD (GNU Binutils) 2.34.50.20200402 assertion fail
/export/gnu/import/git/gitlab/x86-binutils/bfd/elf.c:3652
./ld: BFD (GNU Binutils) 2.34.50.20200402 assertion fail
/export/gnu/import/git/gitlab/x86-binutils/bfd/elf.c:3652
./ld: BFD (GNU Binutils) 2.34.50.20200402 assertion fail
/export/gnu/import/git/gitlab/x86-binutils/bfd/elf.c:3652
./ld: BFD (GNU Binutils) 2.34.50.20200402 assertion fail
/export/gnu/import/git/gitlab/x86-binutils/bfd/elf.c:3652
./ld: BFD (GNU Binutils) 2.34.50.20200402 assertion fail
/export/gnu/import/git/gitlab/x86-binutils/bfd/elf.c:3652
./ld: BFD (GNU Binutils) 2.34.50.20200402 assertion fail
/export/gnu/import/git/gitlab/x86-binutils/bfd/elf.c:3652
make: *** [Makefile:6: y.o] Error 1
binary_confusion_matrix_fpt_dbl.o has
[581]
.rela.text._ZNK4daal15data_management10interface112NumericTable21getNumberOfCategoriesEm
RELA 0000000000000000 02b01c 000000 18 G 2 347 8
COMDAT group section [ 172] `'
[_ZNK4daal15data_management10interface112NumericTable21getNumberOfCategoriesEm]
contains 2 sections:
[Index] Name
[ 347]
.text._ZNK4daal15data_management10interface112NumericTable21getNumberOfCategoriesEm
[ 581]
.rela.text._ZNK4daal15data_management10interface112NumericTable21getNumberOfCategoriesEm
It has zero size relocation section and bfd_elf_final_link removes the
zero-sized relocation section:
if (o->reloc_count > 0)
o->flags |= SEC_RELOC;
else
{
/* Explicitly clear the SEC_RELOC flag. The linker tends to
set it (this is probably a bug) and if it is set
assign_section_numbers will create a reloc section. */
o->flags &=~ SEC_RELOC;
}
/* If the SEC_ALLOC flag is not set, force the section VMA to
zero. This is done in elf_fake_sections as well, but forcing
the VMA to 0 here will ensure that relocs against these
sections are handled correctly. */
if ((o->flags & SEC_ALLOC) == 0
&& ! o->user_set_vma)
o->vma = 0;
Later, linker finds out one section is missing from the section group.
We should keep zero-sized relocation section in a section group or issue
an error for ld -r.
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